digs vs excavation

digs and excavation both are nouns.

Word	Noun	Adjective	Verb	Adverb
digs	Yes	No	No	No
excavation	Yes	No	No	No

As nouns, excavation is a hypernym of digs; that is, excavation is a word with a broader meaning than digs:

digs (noun)	excavation (noun)
temporary living quarters	the act of extracting ores or coal etc from the earth
an excavation for ore or precious stones or for archaeology	the act of digging
	a hole in the ground made by excavating
	the site of an archeological exploration